body{
    font-family: Arial,Helvetica,sans-serif,SimSun;
    position: relative;
}

.welcome{
    width: 100vw;
    height: 100vh;
    z-index: 1000;
    position: absolute;
    background-image: url(../images/cover.jpg);
    background-position: center center;
    background-size: cover;
    background-repeat: no-repeat;
}

.slide-up{
    transform: translateY(-100%);
    transition: all 1.5s ease;
}

.welcome__slogan{
    text-align: center;
    color: aliceblue;
    width: 400px;
    height:100px ;
    position: absolute;
    top: 0;
    bottom: 50px;
    left: 0;
    right: 0;
    margin: auto;
}

.welcome__slogan h1{
    font-size: 32px;
    padding: 10px;
    margin-bottom: 10px;
}

.welcome__slogan p{
    font-style: italic;
    font-size: 16px;
    padding: 10px;
}

.welcome__slogan ul li{
    padding: 10px 20px;
    display: inline-block;
    
}


.welcome__slogan ul li i{
    
    color: white;
    font-size: 32px;
    display: inline-block;
    
}

.welcome__arrow{
    color: aliceblue;
    font-size: 22px;
    text-align: center;
    position: absolute;
    width: 100px;
    height: auto;
    bottom: 50px;
    left: 0;
    right: 0;
    margin: auto;
}

.welcome__arrow i{
    padding: 10px;
    font-size: 32px;
}

header{
    width: 100%;
    height: 80px;
    background-color: #444;
}

header nav{
    display: flex;
    justify-content: space-between;
    width: 50%;
    height: 100%;
    margin: auto;
}

header nav a{
    text-align: center;
    margin: auto;
    color: #eee;
    font-size: 24px;
    border: 10px;
}